Major bump here.
As of right now, anyone who has signed up to compete in the Fishing tournament is free to start catching the Pokemon for their team. You have until now and December 18th to catch and train your team as you see fit. Good luck and have fun.
Anyone who hasn't signed up but is still interested in taking part can still sign up at this point. If you would like to sign up, I suggest you do it sooner rather than later at this point or you may not have enough time to catch anything.
Finally, MAKE SURE YOUR DATE/TIME SETTINGS ARE CORRECT ON YOUR DS! If they're not, you'll risk being disqualified since the catch dates of your Pokemon will be wrong.